--- libaitio/src/bpf.c	2013/06/24 14:43:00	1.1.2.3
+++ libaitio/src/bpf.c	2013/06/25 08:45:50	1.1.2.7
@@ -95,7 +95,7 @@ allocZCbuf(u_int len)
  * return: -1 error or >-1 bpf handle
  */
 int
-io_etherOpen(const char *csIface, int flags, int whdr, u_int buflen, void **zcbuf)
+io_etherOpen(const char *csIface, int flags, int whdr, u_int *buflen, void **zcbuf)
 {
 	int n = 1, eth = -1;
 	register int i;
@@ -124,9 +124,9 @@ io_etherOpen(const char *csIface, int flags, int whdr,
 		close(eth);
 		return -1;
 	}
-	if (buflen) {
+	if (buflen && *buflen) {
 		if (!zcbuf) {
-			if (ioctl(eth, BIOCSBLEN, &buflen) == -1) {
+			if (ioctl(eth, BIOCSBLEN, buflen) == -1) {
 				LOGERR;
 				close(eth);
 				return -1;
@@ -143,8 +143,9 @@ io_etherOpen(const char *csIface, int flags, int whdr,
 				LOGERR;
 				close(eth);
 				return -1;
-			}
-			if (!(*zcbuf = allocZCbuf(MIN(n, buflen)))) {
+			} else
+				*buflen = MIN(n, *buflen);
+			if (!(*zcbuf = allocZCbuf(*buflen))) {
 				close(eth);
 				return -1;
 			}
@@ -170,4 +171,93 @@ io_etherOpen(const char *csIface, int flags, int whdr,
 	}
 
 	return eth;
+}
+
+/*
+ * io_etherSend() - Send packet to bpf
+ *
+ * @eth = bpf handle
+ * @buf = buffer
+ * @buflen = buffer length
+ * return: -1 error or !=-1 written bytes
+ */
+ssize_t
+io_etherSend(int eth, const void *buf, size_t buflen)
+{
+	ssize_t wlen = 0;
+
+	if (!buf || !buflen) {
+		io_SetErr(EINVAL, "invalid arguments");
+		return -1;
+	}
+
+	wlen = write(eth, buf, buflen);
+	if (wlen == -1)
+		LOGERR;
+	return wlen;
+}
+
+#ifdef __FreeBSD__
+static inline ssize_t
+nextZCbuf(void ** __restrict zcache, struct bpf_zbuf * __restrict zbuf, 
+		const void * __restrict buf)
+{
+	ssize_t rlen = -1;
+	struct bpf_zbuf_header *bzh;
+
+	if (!*zcache || *zcache == zbuf->bz_bufb) {
+		bzh = (struct bpf_zbuf_header *) zbuf->bz_bufa;
+		if (bzh->bzh_user_gen != atomic_load_acq_int(&bzh->bzh_kernel_gen)) {
+			rlen = atomic_load_acq_int(&bzh->bzh_kernel_len);
+			*zcache = zbuf->bz_bufa;
+			if (buf)
+				buf = ((caddr_t) *zcache) + sizeof(struct bpf_zbuf_header);
+		}
+	} else if (*zcache == zbuf->bz_bufa) {
+		bzh = (struct bpf_zbuf_header *) zbuf->bz_bufb;
+		if (bzh->bzh_user_gen != atomic_load_acq_int(&bzh->bzh_kernel_gen)) {
+			rlen = atomic_load_acq_int(&bzh->bzh_kernel_len);
+			*zcache = zbuf->bz_bufb;
+			if (buf)
+				buf = ((caddr_t) *zcache) + sizeof(struct bpf_zbuf_header);
+		}
+	}
+
+	return rlen;
+}
+#endif
+
+/*
+ * io_etherRecv() - Receive packet from bpf
+ *
+ * @eth = bpf handle
+ * @buf = buffer
+ * @buflen = buffer length
+ * @zcbuf = zero copy buffer, if BPF supports it and isn't NULL
+ * return: -1 error or !=-1 readed bytes
+ */
+ssize_t
+io_etherRecv(int eth, void * __restrict buf, size_t buflen, void * __restrict zcbuf)
+{
+	ssize_t rlen = 0;
+	void **zcache = NULL;
+
+	if (!buf || !buflen) {
+		io_SetErr(EINVAL, "invalid arguments");
+		return -1;
+	}
+
+	if (!zcbuf) {
+		rlen = read(eth, buf, buflen);
+		if (rlen == -1)
+			LOGERR;
+	} else {
+#ifdef __FreeBSD__
+		rlen = nextZCbuf(zcache, (struct bpf_zbuf*) zcbuf, buf);
+#else
+		io_SetErr(ENOTSUP, "bpf zero copy buffer mode is not supported");
+#endif
+	}
+
+	return rlen;
 }